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Annealing process with extra-deep drawability for ferritic stainless steel

An annealing process, stainless steel technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of low yield of ultra-deep drawing materials, low yield of downstream products, cracking, etc., and achieve the effect of high ultra-deep drawing performance

Inactive Publication Date: 2020-04-17
宁波奇亿金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ferritic stainless steel (because the matrix does not contain nickel, the price is relatively cheap, and has excellent corrosion resistance, so it is widely used. It is mainly used in decorative materials, outdoor advertising billboards, electronic products, tableware, screens, combustion Appliances, architectural decorations, household appliances and home appliance parts, since ferritic stainless steel precision thin strips are commonly used stamping materials, during the cold working process, especially in some deep drawing processes, due to significant work hardening and residual Stress, mold sticking, wrinkling, and cracking are prone to occur, which reduces the yield and becomes a common technical problem in actual production. However, after the traditional ferritic stainless steel coil is rolled and annealed, its elongation after fracture It only reaches 22-26%, and the hardness is controlled at Vickers hardness of 135-155hv, which leads to low ultra-deep drawing performance of stainless steel, low yield of ultra-deep-drawn materials, and low yield of downstream products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] An annealing process for ultra-deep drawing properties of ferritic stainless steel, comprising the following steps:

[0015] (1) Raw material preparation: Roll the raw steel coils with a width of 550 mm to 850 mm to a thickness of 0.2 mm with a rolling mill to obtain a steel coil with a thickness of 0.2 mm;

[0016] (2) Alkali cleaning treatment: the steel coil with a thickness of 0.2 mm obtained in step (1) is used to clean the oil stain on the surface of the steel coil with a thickness of 0.2 mm by an alkali cleaning machine, and the speed of the alkali cleaning machine is set to 50m / min. The temperature is set to 45 degrees to obtain a steel coil with a thickness of 0.2 mm after removal;

[0017] (3) Drying treatment: the removed steel coil with a thickness of 0.2 mm obtained in step (2) is dried with a dryer, and the temperature of the dryer is set to It is 100 degrees, and the time is set to 6 minutes to obtain a steel coil with a thickness of 0.2mm after the dryi...

Embodiment 2

[0023] An annealing process for ultra-deep drawing properties of ferritic stainless steel, comprising the following steps:

[0024] (1) Raw material preparation: Roll the raw steel coil with a width of 550mm to 850mm to a thickness of 0.8mm with a rolling mill to obtain a steel coil with a thickness of 0.8mm;

[0025] (2) Alkali cleaning treatment: use the steel coil with a thickness of 0.8mm obtained in step (1) to clean the oil stain on the surface of the steel coil with a thickness of 0.8mm with an alkali cleaning machine, wherein the speed of the alkali cleaning machine is set to 90m / min, The temperature is set to 75 degrees to obtain a steel coil with a thickness of 0.8mm after removal;

[0026] (3) Drying treatment: remove the steel coils with a thickness of 0.8 mm obtained in step (2), and dry the steel coils with a thickness of 0.8 mm after removal with a dryer, wherein the temperature of the dryer is set to It is 130 degrees, and the time is set to 10 minutes, and th...

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Abstract

The invention belongs to the technical field of heat treatment of metal materials and particularly provides an annealing process with extra-deep drawability for ferritic stainless steel. The annealingprocess comprises the following steps: (1) preparation of raw materials; (2) alkaline cleaning treatment; (3) drying treatment; (4) annealing treatment for the first time; (5) annealing treatment forthe second time; and (6) cooling treatment. A stainless steel coil subjected to 6 process treatment has the percentage elongation after fracture of 27-36% and the Vickers hardness of 135-155 hv. Thus, the invention solves the problems of low extra-deep drawability of stainless steel, low yield of an extra-deep draw material, and low yield of downstream products, which are caused by the fact in the prior art that a traditional ferritic stainless steel coil has the percentage elongation after fracture of only 22-26% and the Vickers hardness of 135-155 hv after being subjected to rolling and annealing. Therefore, the annealing process has the characteristics of high extra-deep drawability, high yield of the extra-deep draw material and high yield of the downstream products.

Description

technical field [0001] The invention discloses the technical field of heat treatment of metal materials, in particular to an annealing process for ultra-deep drawing performance of ferritic stainless steel. Background technique [0002] Ferritic stainless steel (because the matrix does not contain nickel, the price is relatively cheap, and has excellent corrosion resistance, so it is widely used. It is mainly used in decorative materials, outdoor advertising billboards, electronic products, tableware, screens, combustion Appliances, architectural decorations, household appliances and home appliance parts, since ferritic stainless steel precision thin strips are commonly used stamping materials, during the cold working process, especially in some deep drawing processes, due to significant work hardening and residual Stress, mold sticking, wrinkling, and cracking are prone to occur, which reduces the yield and becomes a common technical problem in actual production. However, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/56C21D1/26C23G3/02
CPCC21D1/26C21D9/56C23G3/02
Inventor 王晓军胡斌
Owner 宁波奇亿金属有限公司